WO2024197800A1 - Appareil électrochimique et appareil électronique - Google Patents

Appareil électrochimique et appareil électronique Download PDF

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WO2024197800A1
WO2024197800A1 PCT/CN2023/085420 CN2023085420W WO2024197800A1 WO 2024197800 A1 WO2024197800 A1 WO 2024197800A1 CN 2023085420 W CN2023085420 W CN 2023085420W WO 2024197800 A1 WO2024197800 A1 WO 2024197800A1
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lithium
negative electrode
carbonate
electrolyte
electrochemical device
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Chinese (zh)
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王翔
简俊华
唐超
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Priority to CN202380012125.3A priority Critical patent/CN117461182A/zh
Priority to PCT/CN2023/085420 priority patent/WO2024197800A1/fr
Publication of WO2024197800A1 publication Critical patent/WO2024197800A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/54—Electrolytes
    • H01G11/58—Liquid electrolytes
    • H01G11/60—Liquid electrolytes characterised by the solvent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of electrochemical technology, and in particular to an electrochemical device and an electronic device.
  • the theoretical gram capacity of silicon material is 4200mAh/g, which is much higher than the theoretical gram capacity of graphite material 372mAh/g, but the volume of silicon material expands greatly during the charging and discharging process, and the electrolyte is continuously consumed and decomposed on the surface, resulting in serious cycle capacity decay.
  • the accumulation of by-products causes serious lithium precipitation during charging, making it difficult for silicon materials to be commercialized in lithium-ion batteries.
  • the methods currently used are to modify the structure of silicon materials or add fluoroethylene carbonate to the electrolyte to form interface protection. These methods improve the cycle stability of silicon negative electrodes to a certain extent, but the improvement effect and stability are limited, and they are basically unhelpful in improving the charge rate window. Therefore, how to improve the charge rate window on the basis of improving the cycle performance of lithium-ion batteries containing silicon negative electrodes is a technical problem that needs to be solved urgently by those skilled in the art.
  • the present application provides an electrochemical device and an electronic device to improve the cycle performance and charge rate window of the electrochemical device.
  • lithium-ion batteries are used as an example of electrochemical devices to explain this application, but the electrochemical devices of this application are not limited to lithium-ion batteries.
  • the specific technical solutions are as follows:
  • the present application provides an electrochemical device, comprising an electrolyte, a negative electrode plate, a separator and a positive electrode plate; the electrolyte comprises a compound of formula (I) and a polymerized monomer:
  • X1 , X2 , X3 , X4 , Y1 , Y2 , Y3 and Y4 are each independently selected from O, a C1 to C3 carbon chain or a single bond, X1 and Y1 are not O or a single bond at the same time, X2 and Y2 are not O or a single bond at the same time, X3 and Y3 are not O or a single bond at the same time, X4 and Y4 are not O or a single bond at the same time, at least one of X1 , X2 , Y1 and Y2 is O, and X3 , X4 , Y3 and Y4 are not O or a single bond at the same time.
  • Z1 and Z2 are each independently selected from halogen or C1 to C2 with a terminal polymerization functional group 4 carbon chains, the polymerized functional groups include carboxyl, hydroxyl, aldehyde, acyloxy, amino, alkenyl or alkynyl; the polymerized monomers include at least one of methyl acrylate, methyl methacrylate, vinylene carbonate, vinyl ethylene carbonate, ethylene, propylene, vinyl acetate, difluoroethylene, tetrafluoroethylene, hexafluoropropylene, acrylonitrile, ethylene glycol, ethylene glycol diacrylate, diethylene glycol diacrylate, ethylene oxide, dioxolane, 2,6-dimethylphenol, 3,4-ethylenedioxythiophene or 4,6-diamino-1,3-diphenol; based on the mass of the electrolyte, the mass percentage of the compound of formula (I) is m%, 0.
  • the compounds of formula (I) and the polymerized monomers can be cross-linked and polymerized to produce a regular structure similar to an organic molecular skeleton (COFs) on the positive electrode sheet and the negative electrode sheet.
  • This structure as a mesh skeleton of the SEI film, takes into account both rigidity and flexibility, can block the contact between the electrolyte and the negative electrode sheet, and inhibit the oxidative decomposition of the organic solvent in the electrolyte under high voltage.
  • the above-mentioned skeleton structure is combined with the electrolyte to make the electrochemical device have a lower impedance.
  • the electrochemical device can still improve the cycle performance under high-rate charging conditions. As a result, the cycle performance and charge rate window of the electrochemical device are improved.
  • the mass percentage of the polymerized monomer is controlled within the above preferred range, the cycle performance and charge rate window of the electrochemical device are better.
  • the compound of formula (I) includes at least one of the following compounds of formula (I-1) to formula (I-8):
  • the molar mass of the compound of formula (I) is M (I) g/mol
  • the molar mass of the polymerized monomer is M single g/mol
  • m, n, M (I) and M single satisfy: 2 ⁇ (n/M single )/(m/M (I) ) ⁇ 200.
  • the negative electrode material layer further includes an inorganic solid electrolyte, and the inorganic solid electrolyte includes any one of an inorganic oxide material or an inorganic sulfide material; based on the mass of the negative electrode material layer, the mass percentage of the inorganic solid electrolyte is ⁇ %, and 0.01 ⁇ 5.
  • the negative electrode material layer includes an inorganic solid electrolyte, and the mass percentage of the inorganic solid electrolyte in the negative electrode material layer is regulated within the above range, which is conducive to improving the cycle performance and charge rate window of the electrochemical device.
  • 0.5 ⁇ n/ ⁇ 100, and regulating the value of n/ ⁇ within the above range is beneficial to improving the cycle performance and charge rate window of the electrochemical device.
  • the crystalline structure of the inorganic oxide material includes at least one of NASICON type, LISICON type, perovskite type or garnet type;
  • the chemical formula of the NASICON type inorganic oxide material is Li 1+x M1 x D1 2-x (PO 4 ) 3 , wherein 0.01 ⁇ x ⁇ 0.5, M1 includes at least one of Al, Y, Ga, Cr, In, Fe, Se or La, and D1 includes at least one of Ti, Ge, Ta, Zr, Sn, Fe, V, and Hf;
  • the chemical formula of the LISICON type inorganic oxide material is Li 14 M2(D2O 4 ) 4 , wherein M2 includes at least one of Zr, Cr, Sn or Zn, and D2 includes at least one of Si, Ge, S or P;
  • the chemical formula of the perovskite type inorganic oxide material is Li 3y M3 2/3-y D3O 3 , wherein 0.01 ⁇ y ⁇ 0.5, M3 includes at least
  • the electrolyte further includes an initiator, and the initiator includes at least one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, or methyl ethyl ketone peroxide; based on the mass of the electrolyte, the mass percentage of the initiator is 0.001% to 2%.
  • the electrolyte includes the above-mentioned types of initiators and the mass percentage of the initiator in the electrolyte is regulated within the above range, which is conducive to improving the cycle performance and charge rate window of the electrochemical device.
  • the electrolyte further includes an additive containing an unsaturated bond
  • the additive containing an unsaturated bond includes at least one of fluoroethylene carbonate, vinylene carbonate, vinyl ethylene carbonate, 1,3-propylene sultone, 1,3-propane sultone, 3-hexenedicyanide, fumaric anhydride or triallylmethoxysilane; based on the mass of the electrolyte, the mass percentage of the additive containing an unsaturated bond is 0.01% to 40%.
  • the electrolyte includes the above-mentioned type of additive containing an unsaturated bond, and the mass percentage of the additive containing an unsaturated bond is regulated within the above range, which is conducive to improving the cycle performance and charge rate window of the electrochemical device.
  • the silicon-containing negative electrode active material includes at least one of SiO w , a silicon-carbon compound, or a silicon single substance, and 0.5 ⁇ w ⁇ 1.5.
  • the electrolyte further includes an organic solvent
  • the organic solvent includes at least one of a carbonate, a carboxylate or an ether
  • the carbonate includes at least one of dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, ethylene carbonate, dipropyl carbonate, methylpropyl carbonate, fluoroethylene carbonate, difluoroethylene carbonate, pentafluoropropyl ethylene carbonate, methyl trifluoroethyl carbonate, trifluoromethyl ethylene carbonate or di(2,2,2-trifluoroethyl) carbonate
  • the carboxylate includes at least one of propyl propionate, ethyl propionate, ethyl acetate, ethyl formate, methyl acetate, methyl propionate, propyl acetate, butyl butyrate, ethyl difluoroacetate, difluoroeth
  • the ether includes at least one of 1,3-dioxane, 1,4-dioxane, 1,3-dioxolane, 4-methyl-1,3-dioxolane, diethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, ethylene glycol formic acid ethyl ether, diethoxymethane, 1,3-dimethoxypropane, 1,1,3,3-tetraethoxypropane ether or 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether; based on the mass of the electrolyte, the mass percentage of carbonate is 20% to 80%, the mass percentage of carboxylic acid ester is 0% to 40%, and the mass percentage of ether is 0% to 60%.
  • the electrolyte also includes a lithium salt
  • the lithium salt includes at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, lithium tetraphenylborate, lithium methanesulfonate, lithium bis(fluorosulfonyl)imide, lithium trifluoromethanesulfonate, lithium bis(trifluoromethylsulfonyl)methyl lithium, lithium hexafluorosilicate, lithium dioxalatoborate or lithium difluorooxalatoborate; based on the mass of the electrolyte, the mass percentage of the lithium salt is 6% to 20%.
  • the second aspect of the present application provides an electronic device, which includes the electrochemical device described in any of the above embodiments. Therefore, the electronic device has good performance.
  • the present application provides an electrochemical device and an electronic device, wherein the electrochemical device comprises an electrolyte, a negative electrode sheet, The separator and the positive electrode plate; the electrolyte comprises a compound of formula (I) and a polymerized monomer, based on the mass of the electrolyte, the mass percentage of the compound of formula (I) is m%, 0.01 ⁇ m ⁇ 6, and the mass percentage of the polymerized monomer is n%, 0.5 ⁇ n ⁇ 10; the negative electrode plate comprises a negative electrode current collector and a negative electrode material layer disposed on at least one surface of the negative electrode current collector, and the negative electrode material layer comprises a silicon-containing negative electrode active material.
  • the electrochemical device obtained by the above arrangement has good cycle performance and a wide charging rate window.
  • lithium-ion batteries are used as an example of electrochemical devices to explain the present application, but the electrochemical devices of the present application are not limited to lithium-ion batteries.
  • the specific technical solutions are as follows:
  • the present application provides an electrochemical device, comprising an electrolyte, a negative electrode plate, a separator and a positive electrode plate; the electrolyte comprises a compound of formula (I) and a polymerized monomer:
  • X1 , X2 , X3 , X4 , Y1 , Y2 , Y3 and Y4 are each independently selected from O, a C1 to C3 carbon chain or a single bond, X1 and Y1 are not O or a single bond at the same time, X2 and Y2 are not O or a single bond at the same time, X3 and Y3 are not O or a single bond at the same time, X4 and Y4 are not O or a single bond at the same time, at least one of X1 , X2 , Y1 and Y2 is O, and at least one of X3 , X4 , Y3 and Y4 is O; Z1 and Z2 are each independently selected from halogen or a C1 to C3 carbon chain having a polymerizable functional group at the end; 4 carbon chains, the polymerized functional groups include carboxyl, hydroxyl, aldehyde, acyloxy
  • n is 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or any value between any two of the above numerical ranges.
  • the inventors have found through extensive research that the compound of formula (I) and the polymerized monomer have the function of cross-linking polymerization, and can form a two-dimensional network or three-dimensional cage-shaped organic polymer, or the polymerized monomer undergoes polymerization to form the main chain segment and the monomer and oligomer of the functional chain segment of the organic polymer, which are attached to the surface of the silicon-containing negative electrode active material.
  • the oxygen in the cyclic ether bond of the compound of formula (I) easily forms a hydrogen bond with the hydroxyl group on the surface of the silicon-containing negative electrode active material, and has affinity with the interface of the silicon-containing negative electrode active material.
  • the mass percentage of the compound of formula (I) is less than 0.01%, and/or the mass percentage of the polymerized monomer is less than 0.5%, and the amount of organic polymer generated is insufficient, which easily causes poor contact between the inorganic solid electrolyte and the negative electrode active material particles, thereby increasing the impedance of the negative electrode plate and the polarization of the electrochemical device; the mass percentage of the compound of formula (I) is greater than 6%, and/or the mass percentage of the polymerized monomer is greater than 10%, and the amount of organic polymer generated is too much, which easily causes the lithium ion desolvation energy barrier to rise, thereby the negative electrode plate impedance will also be too large, charging lithium deposition, in addition, it will also cause a large number of residual monomers, continuous reaction and consumption of lithium ions during the charge and discharge process, and rapid capacity decay of the electrochemical device.
  • the compounds of formula (I) and the polymerized monomers can be cross-linked and polymerized to produce a regular structure similar to a covalent organic framework (COFs) on the positive electrode and the negative electrode.
  • COFs covalent organic framework
  • the structure as a mesh skeleton of the SEI film, takes into account both rigidity and flexibility, can block the contact between the electrolyte and the negative electrode, and inhibit the oxidative decomposition of the organic solvent in the electrolyte at a high voltage (greater than or equal to 4.25V).
  • the above-mentioned skeleton structure is combined with the electrolyte to make the electrochemical device have a lower impedance, so that even if the silicon-containing negative electrode active material expands in volume during the charge and discharge process of the electrochemical device, the electrochemical device can still improve the cycle performance under high rate (greater than or equal to 0.5C) charging conditions. As a result, the cycle performance and charge rate window of the electrochemical device are improved.
  • negative electrode material layer disposed on at least one surface of the negative electrode current collector means that the negative electrode material layer can be disposed on one surface of the negative electrode current collector or on both surfaces of the negative electrode current collector, and the above-mentioned “surface” refers to the entire area or a portion of the surface of the negative electrode current collector.
  • m is 0.05, 0.5, 1, 1.5, 2, 2.5, 3 or any value between any two of the above numerical ranges.
  • n is 1, 2, 3, 4, 5, 6, or any number between any two of the above ranges.
  • the compound of formula (I) includes at least one of the following compounds of formula (I-1) to formula (I-8):
  • the molar mass of the compound of formula (I) is M (I) g/mol
  • the molar mass of the polymerized monomer is M single g/mol
  • m, n, M (I) and M single satisfy: 2 ⁇ (n/M single )/(m/M (I) ) ⁇ 200.
  • the value of (n/M single )/(m/M (I) ) is 2, 3, 10, 20, 30, 50, 100, 150, 200 or any value between any two of the above numerical ranges.
  • the compound of formula (I) and the polymerized monomer can realize directional control of the organic polymer repeating unit composition and design of the organic polymer type.
  • the compound of formula (I) and the polymerized monomer have a polymer structure formed by cross-linking polymerization, which has more suitable rigidity and flexibility, is beneficial to blocking the contact between the electrolyte and the negative electrode plate, inhibits the oxidative decomposition of the organic solvent in the electrolyte under high voltage, and is beneficial to reducing the impedance of the electrochemical device, thereby improving the cycle performance and charge rate window of the electrochemical device.
  • (n/M single )/(m/M (I) ) can also be understood as ⁇ (n/M single )/ ⁇ (m/M (I) ).
  • the negative electrode material layer also includes an inorganic solid electrolyte, and the inorganic solid electrolyte includes any one of an inorganic oxide material or an inorganic sulfide material; based on the mass of the negative electrode material layer, the mass percentage of the inorganic solid electrolyte is ⁇ %, and 0.01 ⁇ 5.
  • the value of ⁇ is 0.01, 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 or any value between any two of the above numerical ranges.
  • the negative electrode material layer includes an inorganic solid electrolyte, and the silicon-containing negative electrode active material is partially or completely coated by the inorganic solid electrolyte.
  • the inorganic solid electrolyte has good electrical conductivity and mechanical stability, and can improve the charging performance and cycle stability of the negative electrode plate.
  • the silicon-containing negative electrode active material coated with the inorganic solid electrolyte works synergistically with the electrolyte containing the compound of formula (I) and the polymerized monomer in the present application.
  • the electrolyte is polymerized in situ to form a negative electrode SEI film, which complements the inorganic solid electrolyte, improves the interface compatibility between the electrolyte and the negative electrode plate, and can improve the cycle performance and rate performance of the high energy density silicon-based negative electrode.
  • the mass percentage of the inorganic solid electrolyte in the negative electrode material layer is controlled within the above range, matching the content of the compound of formula (I) and the polymerized monomer, which can stabilize the interface between the negative electrode plate and the electrolyte, and widen the charge rate window of the electrochemical device of the silicon-based negative electrode to 0.5C and above, thereby improving the cycle performance and charge rate window of the electrochemical device.
  • 0.5 ⁇ n/ ⁇ 100 In some embodiments of the present application, 0.5 ⁇ n/ ⁇ 100.
  • the value of n/ ⁇ is 0.5, 1, 5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100 or any value between any two of the above numerical ranges.
  • the inorganic solid electrolyte has the function of a fast ion conductor, and the value of n/ ⁇ is regulated within the above range.
  • the contact interface between the inorganic solid electrolyte and the silicon-containing negative electrode active material has good density, and the SEI film generated by the in-situ polymerization of the polymerized monomer has a good protective effect on the silicon-containing negative electrode active material, so that the possibility of the silicon-containing negative electrode active material breaking and decomposing during the charge and discharge cycle of the electrochemical device is reduced, and the electrolyte has a suitable degree of polymerization, and there are enough liquid components remaining after the polymerized monomers are polymerized, so that the electrochemical device has a lower impedance. As a result, the cycle performance and charge rate window of the electrochemical device are improved.
  • ⁇ is 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 or any value between any two of the above numerical ranges. Controlling the mass percentage of the inorganic solid electrolyte in the negative electrode material layer within the above preferred range is conducive to further improving the cycle performance and charge rate window of the electrochemical device.
  • n/ ⁇ 30 Preferably, 1 ⁇ n/ ⁇ 30.
  • the value of n/ ⁇ is 1, 5, 10, 15, 20, 25, 30, or any value between any two of the above ranges. Regulating the value of n/ ⁇ within the above preferred range is beneficial to further improve the cycle performance and charge rate window of the electrochemical device.
  • 0.1 ⁇ 5, 1 ⁇ n/ ⁇ 30 Preferably, 0.1 ⁇ 5, 1 ⁇ n/ ⁇ 30. Controlling the mass percentage of the inorganic solid electrolyte in the negative electrode material layer and the value of n/ ⁇ within the above preferred ranges is beneficial to further improving the cycle performance and charge rate window of the electrochemical device.
  • the crystalline structure of the inorganic oxide material includes NASICON type, LISICON type
  • the chemical formula of the NASICON type inorganic oxide material is Li 1+x M1 x D1 2-x (PO 4 ) 3 , wherein 0.01 ⁇ x ⁇ 0.5, M1 includes at least one of Al, Y, Ga, Cr, In, Fe, Se or La, and D1 includes at least one of Ti, Ge, Ta, Zr, Sn, Fe, V and Hf;
  • the chemical formula of the LISICON type inorganic oxide material is Li 14 M2(D2O 4 ) 4 , wherein M2 includes at least one of Zr, Cr, Sn or Zn, and D2 includes at least one of Si, Ge, S or P;
  • the chemical formula of the perovskite type inorganic oxide material is Li 3y M3 2/3-y D3O 3 , wherein 0.01 ⁇ y ⁇ 0.5, M3 includes at least one of La, Al, Mg, Fe or Ta, and D3
  • the electrolyte includes the above-mentioned type of initiator and the mass percentage of the initiator in the electrolyte is regulated within the above-mentioned range.
  • the initiator can further enhance the polymerization effect of the compound of formula (I) and the polymerized monomer, as well as the polymerization effect of the polymerized monomer itself, so as to form an organic polymer that is better attached to the surface of the silicon-containing negative electrode active material and/or the surface of the inorganic solid electrolyte to block the contact between the electrolyte and the negative electrode plate, inhibit the oxidative decomposition of the organic solvent in the electrolyte under high voltage, reduce the impedance of the electrochemical device, and thus improve the cycle performance and charge rate window of the electrochemical device.
  • the compound of formula (I) and the polymerized monomer, or the polymerized monomer can also be induced to undergo polymerization reaction under any of the initiation modes of electrical initiation (current catalytic polymerization reaction), photoinitiation (ultraviolet light catalytic polymerization reaction) or thermal initiation (high temperature catalytic polymerization reaction) to form an organic polymer, or monomers and oligomers of the main chain segment and functional segment of the organic polymer, which are attached to the surface of the silicon-containing negative electrode active material and the surface of the inorganic solid electrolyte.
  • electrical initiation current catalytic polymerization reaction
  • photoinitiation ultraviolet light catalytic polymerization reaction
  • thermal initiation high temperature catalytic polymerization reaction
  • the cross-linking polymerization of the compound of formula (I) and the polymerized monomer to form an organic polymer, and the polymerization of the polymerized monomer to form an organic polymer are all generated in the electrochemical device process stage.
  • the polymerization is initiated by heat, or in the formation stage, the polymerization is initiated by electricity.
  • the electrolyte further comprises an additive containing an unsaturated bond.
  • the additive includes at least one of fluoroethylene carbonate, vinylene carbonate, vinyl ethylene carbonate, 1,3-propylene sultone, 1,3-propane sultone, 3-hexenedicyanide, fumaric anhydride or triallylmethoxysilane; based on the mass of the electrolyte, the mass percentage of the additive containing an unsaturated bond is 0.01% to 40%.
  • the mass percentage of the additive containing an unsaturated bond is 0.01%, 0.05%, 1%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or any value between any two of the above numerical ranges.
  • the electrolyte includes the above-mentioned type of additive containing unsaturated bonds, and the mass percentage of the additive containing unsaturated bonds is controlled within the above-mentioned range.
  • the unsaturated bond additive copolymerizes with the polymerization monomer, and the formed copolymer also has the function of adjusting the physical properties and electrochemical properties of the above-mentioned organic polymer, and can also improve the ionic conductivity, oxidation resistance or reduction resistance window of the copolymer to produce a synergistic effect, which can further improve the cycle performance and charge rate window of the electrochemical device.
  • the above-mentioned "unsaturated bond” refers to a double bond, a triple bond, or a ring formed by bonding of elements such as carbon, nitrogen, oxygen, sulfur, or phosphorus.
  • the silicon-containing negative electrode active material includes at least one of SiO w , silicon-carbon compound or silicon element, 0.5 ⁇ w ⁇ 1.5; the silicon-carbon compound includes silicon element, carbon element and oxygen element, and the mass ratio of silicon element, carbon element and oxygen element is 1:1:1 to 6:3:0.
  • the electrolyte further comprises an organic solvent, the organic solvent comprising at least one of carbonate, carboxylate or ether; in one embodiment, the organic solvent comprises carbonate; in one embodiment, the organic solvent comprises carboxylate; in one embodiment, the organic solvent comprises ether; in one embodiment, the organic solvent comprises carbonate and carboxylate; in one embodiment, the organic solvent comprises carbonate and ether; in one embodiment, the organic solvent comprises carboxylate and ether; in one embodiment, the organic solvent comprises carbonate, carboxylate and ether.
  • the carbonate ester includes at least one of dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate (DEC), propylene carbonate (also known as propylene carbonate, abbreviated as PC), ethylene carbonate (EC), dipropyl carbonate, methylpropyl carbonate, fluoroethylene carbonate, difluoroethylene carbonate, pentafluoropropylethylene carbonate, methyl trifluoroethyl carbonate, trifluoromethylethylene carbonate or di(2,2,2-trifluoroethyl) carbonate, and the carboxylic acid ester includes propyl propionate, ethyl propionate, ethyl acetate, ethyl formate, methyl acetate, methyl propionate, propyl acetate, butyl butyrate, At least one of ethyl difluoroacetate, difluoroethyl acetate, ethyl trifluoroacetate,
  • the mass percentage of carbonate is 20% to 80%
  • the mass percentage of carboxylic acid ester is 0% to 40%
  • the mass percentage of ether is 0% to 60%.
  • the mass percentage of carbonate is 20%, 30%, 40%, 50%, 60%, 70%, 80% or any two of the above numerical ranges.
  • the mass percentage of carboxylate is 0%, 10%, 20%, 30%, 40% or any value between any two of the above numerical ranges
  • the mass percentage of ether is 0%, 10%, 20%, 30%, 40%, 50%, 60% or any value between any two of the above numerical ranges.
  • the selection of the above-mentioned organic solvents and the regulation of the mass percentages of carbonate, carboxylate and ether in the electrolyte within the above-mentioned ranges are conducive to the electrolyte having good wettability for the positive electrode active material and the negative electrode active material, improving the transmission speed of lithium ions, and making the electrolyte have good stability, reducing the occurrence of risks such as decomposition and gas production of the electrolyte, thereby improving the cycle performance and rate performance of the electrochemical device.
  • the electrolyte further includes a lithium salt
  • the lithium salt includes lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium hexafluoroarsenate (LiAsF 6 ), lithium perchlorate (LiClO 4 ), lithium tetraphenylborate (LiB(C 6 H 5 ) 4 ), lithium methanesulfonate (LiCH 3 SO 3 ), lithium bis(fluorosulfonyl)imide (LiFSI), lithium trifluoromethanesulfonate (LiCF 3 SO 3 (LiTA)), lithium bis(trifluoromethanesulfonyl)imide (LiN(SO 2 CF 3 ) 2 (LiTFSI)), tris(trifluoromethylsulfonyl)methyl lithium (LiC(SO 2 CF 3 ) 3 ), lithium hex
  • the mass percentage of the lithium salt is 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20% or any value between any two of the above ranges. Selecting the above types of lithium salts and regulating their mass percentage in the electrolyte within the above range is conducive to accelerating the transmission of lithium ions and improving the cycle performance of the electrochemical device.
  • the negative electrode current collector may include copper foil, copper alloy foil, nickel foil, stainless steel foil, titanium foil, nickel foam or copper foam, etc.
  • the negative electrode active material layer of the present application contains a negative electrode active material.
  • the thickness of the negative electrode current collector and the negative electrode active material layer there is no particular restriction on the thickness of the negative electrode current collector and the negative electrode active material layer, as long as the purpose of the present application can be achieved.
  • the thickness of the negative electrode current collector is 6 ⁇ m to 10 ⁇ m, and the thickness of the negative electrode active material layer is 30 ⁇ m to 130 ⁇ m.
  • the negative electrode active material layer may also include at least one of a conductive agent, a stabilizer, and a binder.
  • the present application has no particular restrictions on the types of conductive agents, stabilizers and binders in the negative electrode active material layer, as long as the purpose of the present application can be achieved.
  • the present application has no particular restrictions on the mass ratio of negative electrode active materials, conductive agents, stabilizers and binders in the negative electrode active material layer, as long as the purpose of the present application can be achieved.
  • the mass ratio of the negative electrode active material, the conductive agent, the binder and the stabilizer in the negative electrode active material layer is (75-95):(0.01-8):(0.01-20):(0.01-10).
  • the present application has no special restrictions on the positive electrode plate, as long as the purpose of the present application can be achieved.
  • the positive electrode plate includes a positive current collector and a positive active material layer.
  • the present application has no special restrictions on the positive current collector, as long as the purpose of the present application can be achieved.
  • the positive current collector may include aluminum foil, aluminum alloy foil or a composite current collector, etc.
  • the positive active material layer of the present application includes positive active materials.
  • the present application has no special restrictions on the type of positive active materials, as long as the purpose of the present application can be achieved.
  • the positive active material may include lithium nickel cobalt manganese oxide (NCM811, NCM622, NCM523, NCM111, Ni88), lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium-rich manganese-based materials, lithium cobalt oxide (LiCoO 2 ), At least one of lithium manganate, lithium iron manganese phosphate or lithium titanate.
  • the positive active material may also contain non-metallic elements, for example, non-metallic elements include at least one of fluorine, phosphorus, boron, chlorine, silicon or sulfur, which can further improve the stability of the positive active material.
  • the thickness of the positive current collector and the positive active material layer there is no particular restriction on the thickness of the positive current collector and the positive active material layer, as long as the purpose of the present application can be achieved.
  • the thickness of the positive current collector is 5 ⁇ m to 20 ⁇ m, preferably 6 ⁇ m to 18 ⁇ m.
  • the thickness of the single-sided positive active material layer is 30 ⁇ m to 120 ⁇ m.
  • the positive active material layer may be arranged on one surface in the thickness direction of the positive current collector, or on two surfaces in the thickness direction of the positive current collector.
  • the positive active material layer may also include a conductive agent and a binder.
  • the present application does not particularly limit the types of conductive agents and binders in the positive active material layer, as long as the purpose of the present application can be achieved.
  • the present application has no particular restrictions on the mass ratio of the positive electrode active material, the conductive agent, and the binder in the positive electrode active material layer. Those skilled in the art can select according to actual needs as long as the purpose of the present application can be achieved.
  • the mass ratio of the positive electrode active material, the conductive agent, and the binder in the positive electrode active material layer is (97.5-97.9): (0.9-1.7): (1.0-2.0).
  • the material of the diaphragm may include but is not limited to polyethylene (PE), polypropylene (PP)-based polyolefin (PO), polyester (such as polyethylene terephthalate (PET)), cellulose, polyimide (PI), polyamide (PA), spandex or aramid at least one;
  • the type of diaphragm may include but is not limited to woven membrane, non-woven membrane (non-woven fabric), microporous membrane, composite membrane, diaphragm paper, rolled membrane or spinning membrane at least one.
  • the diaphragm may include a substrate layer and a surface treatment layer.
  • the substrate layer may be a non-woven fabric, a membrane or a composite membrane with a porous structure, and the material of the substrate layer may include at least one of polyethylene, polypropylene, polyethylene terephthalate or polyimide.
  • a polypropylene porous membrane, a polyethylene porous membrane, a polypropylene non-woven fabric, a polyethylene non-woven fabric or a polypropylene-polyethylene-polypropylene porous composite membrane may be used.
  • a surface treatment layer is provided on at least one surface of the substrate layer, and the surface treatment layer may be a polymer layer or an inorganic layer, or a layer formed by a mixed polymer and an inorganic substance.
  • the inorganic layer includes inorganic particles and a binder, and the inorganic particles are not particularly limited, for example, they can be selected from at least one of aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, cerium dioxide, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide or barium sulfate.
  • the binder is not particularly limited, for example, it can be selected from at least one of polyvinylidene fluoride, copolymer of vinylidene fluoride-hexafluoropropylene, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylic acid salt, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene or polyhexafluoropropylene.
  • the polymer layer contains a polymer, and the material of the polymer includes at least one of polyamide, polyacrylonitrile, acrylate polymer, polyacrylic acid, polyacrylic acid salt, polyvinylpyrrolidone, polyvinyl ether, polyvinylidene fluoride or poly (vinylidene fluoride-hexafluoropropylene) etc.
  • the electrochemical device of the present application may also include a packaging bag, which is not particularly limited in the present application and may be any packaging bag known in the art as long as it can achieve the purpose of the present application, such as an aluminum-plastic film or a steel shell.
  • a packaging bag which is not particularly limited in the present application and may be any packaging bag known in the art as long as it can achieve the purpose of the present application, such as an aluminum-plastic film or a steel shell.
  • the present application does not particularly limit the type of electrochemical device, which may include any device that undergoes an electrochemical reaction.
  • the electrochemical device may include, but is not limited to: a lithium metal secondary battery, a lithium ion secondary battery (lithium ion battery), a sodium ion secondary battery (sodium ion battery), a lithium polymer secondary battery, and a lithium ion polymer secondary battery.
  • the preparation method of the electrochemical device includes but is not limited to the following steps: stacking the positive electrode sheet, the separator and the negative electrode sheet in order, and winding, folding and other operations as needed to obtain an electrode assembly with a wound structure, placing the electrode assembly in a packaging bag, injecting an electrolyte into the packaging bag and sealing it to obtain an electrochemical device; or stacking the positive electrode sheet, the separator and the negative electrode sheet in order, and then fixing the four corners of the entire stacked structure to obtain an electrode assembly with a stacked structure, placing the electrode assembly in a packaging bag, injecting an electrolyte into the packaging bag and sealing it to obtain an electrochemical device.
  • the second aspect of the present application provides an electronic device, which includes the electrochemical device described in any of the above embodiments. Therefore, the electronic device has good performance.
  • the electronic devices of the present application are not particularly limited, and may include but are not limited to: laptop computers, pen-input computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, LCD televisions, portable cleaners, portable CD players, mini CDs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.
  • the lithium-ion battery (state of charge 0%, working voltage 2.5V) was disassembled to obtain the negative electrode plate.
  • the negative electrode plate was cleaned with dimethyl carbonate (DMC), X-ray diffraction (XRD) was used to test the structural type of the inorganic solid electrolyte in the negative electrode material layer on the surface of the negative electrode plate, and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was used to test the composition of the inorganic solid electrolyte.
  • DMC dimethyl carbonate
  • XRD X-ray diffraction
  • SEM-EDS scanning electron microscopy-energy dispersive spectroscopy
  • the lithium ion battery (charge state of 0%, working voltage 2.5V) was disassembled to obtain an electrolyte, and the mass percentage of the organic solvent, the compound of formula (I), the polymerization monomer, the initiator, and the unsaturated bond additive in the electrolyte was tested by gas chromatography-mass spectrometry (GCMS), and the mass percentage of the lithium salt was tested by ion chromatography-mass spectrometry.
  • GCMS gas chromatography-mass spectrometry
  • the mass percentage of LiPF6 is 8%
  • the mass percentage of LiFSI is 6%
  • the rest is organic solvent.
  • the sum of the mass percentages of the organic solvent, lithium salt, the compound of formula (I) and the polymerized monomer is 100%.
  • the negative electrode active material SiO, the conductive agent conductive carbon black (Super P), the binder styrene butadiene rubber (SBR, solid content 45wt%), and the stabilizer sodium carboxymethyl cellulose (CMC-Na, weight average molecular weight of about 400000) were mixed in a mass ratio of 86:2:2:10, and then deionized water was added as a solvent, and stirred under the action of a vacuum mixer until the solid content was 53wt% and the system was uniform.
  • the negative electrode slurry was evenly coated on one surface of the negative electrode current collector copper foil with a thickness of 8 ⁇ m, and dried at 85°C to obtain a negative electrode sheet with a single-sided coating of the negative electrode active material layer (thickness 130 ⁇ m). After that, the above steps were repeated on the other surface of the copper foil to obtain a negative electrode sheet with a double-sided coating of the negative electrode active material layer. After cold pressing, cutting, and slitting, it was dried under vacuum conditions at 120°C for 12h to obtain a negative electrode sheet with a specification of 76mm ⁇ 851mm for standby use.
  • the positive electrode active material Ni88 Li[Ni 0.88 Co 0.02 Mn 0.1 ]O 2
  • the binder polyvinylidene fluoride (PVDF) was added as a solvent.
  • the mixture was stirred in a vacuum mixer until the solid content was 75wt% and the system was uniform.
  • the positive electrode slurry was evenly coated on one surface of a positive electrode current collector aluminum foil with a thickness of 10 ⁇ m, and dried at 85°C for 4h to obtain a positive electrode sheet with a single-sided coating of a positive electrode active material layer (thickness 110 ⁇ m).
  • the above steps were repeated on the other surface of the aluminum foil to obtain a positive electrode sheet with a double-sided coating of a positive electrode active material layer.
  • the positive electrode sheet was dried at 85°C in a vacuum oven. After drying for 4 h under air conditions, a positive electrode sheet with a specification of 74 mm ⁇ 867 mm was obtained for standby use.
  • a polyethylene film with a thickness of 7 ⁇ m was used.
  • the negative electrode sheet, separator and positive electrode sheet prepared above are stacked and wound in sequence to obtain an electrode assembly with a wound structure.
  • the electrode assembly is placed in an aluminum-plastic film packaging bag, and the electrolyte is injected after drying.
  • the lithium-ion battery is obtained through vacuum packaging, high-temperature standing, formation, degassing, trimming and other processes.
  • the high-temperature standing temperature is 60°C and the standing time is 14h.
  • the upper limit voltage of the formation is 4.15V
  • the formation temperature is 70°C
  • the formation standing time is 2h.
  • Example 1-1 Except for adjusting the relevant preparation parameters according to Table 1, the rest is the same as Example 1-1.
  • Example 1-4 Except for adjusting the relevant preparation parameters according to Table 1, the rest is the same as Example 1-4.
  • Example 1-8 Except for adjusting the relevant preparation parameters according to Table 1, the rest is the same as Example 1-8.
  • Example 1-4 Except for adjusting the relevant preparation parameters according to Table 1, the rest is the same as Example 1-4.
  • the negative electrode active material SiO, the inorganic solid electrolyte Li 7 La 3 Zr 2 O 12 (garnet-type inorganic oxide material), the conductive agent conductive carbon black (Super P), the binder styrene butadiene rubber (SBR, solid content 45wt%), and the stabilizer sodium carboxymethyl cellulose (CMC-Na, weight average molecular weight of about 400000) were mixed in a mass ratio of 85:1:2:2:10, and then deionized water was added as a solvent, and stirred in a vacuum mixer until the solid content was 53wt% and the system was uniform.
  • the slurry was evenly coated on one surface of a negative electrode current collector copper foil with a thickness of 8 ⁇ m, and dried at 85°C to obtain a negative electrode sheet with a negative electrode active material layer (thickness 130 ⁇ m) coated on one side. After that, the above steps were repeated on the other surface of the copper foil to obtain a negative electrode sheet with a negative electrode active material layer coated on both sides. After cold pressing, cutting, and slitting, it was dried under vacuum conditions at 120°C for 12 hours to obtain a negative electrode sheet with a specification of 76 mm ⁇ 851 mm for standby use.
  • Example 2-1 Except for adjusting the relevant preparation parameters according to Table 2, the rest is the same as Example 2-1.
  • Example 2-1 Except for adjusting the relevant preparation parameters according to Table 2, the rest is the same as Example 2-1.
  • Example 2-1 The rest is the same as Example 2-1 except that Li 7 La 3 Zr 2 O 12 is replaced by Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 in ⁇ Preparation of Negative Electrode Sheet>.
  • Example 3-2 to Example 3-6
  • Example 3-1 Except that the mass percentage of the initiator is adjusted to y% according to Table 3, the mass percentage of the organic solvent is reduced accordingly, and the mass percentage of the compound of formula (I), lithium salt and polymerization monomer remain unchanged, the rest is the same as Example 3-1.
  • Example 3-5 Except for adjusting the relevant preparation parameters according to Table 3, the rest is the same as Example 3-5.
  • Example 3-14 Except for adjusting the relevant preparation parameters according to Table 3, the rest is the same as Example 3-14.
  • Example 1-1 Except for adjusting the relevant preparation parameters according to Table 1, the rest is the same as Example 1-1.
  • Examples 1-1 to 1-20 and Comparative Examples 1 to 9 that the lithium ion batteries in which the compound of formula (I) of the present application and the polymerized monomer are simultaneously added to the electrolyte, and the mass percentage of the compound of formula (I) and the polymerized monomer is within the range of the present application, have higher cycle numbers at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium ion batteries of the embodiments have higher cycle performance and a wider charge rate window, and their cycle performance and charge rate window are improved.
  • the electrolyte of Comparative Example 1 did not contain the compound of formula (I) and the polymerized monomer of the present application; the electrolytes of Comparative Examples 2 and 3 contained the polymerized monomer of the present application, but did not contain the compound of formula (I) of the present application; the electrolytes of Comparative Examples 4 to 6 contained the compound of formula (I) of the present application, but did not contain the polymerized monomer of the present application; the electrolytes of Comparative Examples 7 and 8 contained both the compound of formula (I) of the present application and the polymerized monomer, but the mass percentage of the polymerized monomer was not within the scope of the present application; the electrolyte of Comparative Example 9 contained both the compound of formula (I) of the present application and the polymerized monomer of the present application.
  • the lithium ion batteries of Comparative Examples 1 to Comparative Examples 9 have lower cycle numbers at charge rates of 0.2C, 0.5C and 1C, or have lower cycle numbers at charge rates of 0.5C and 1C, or have lower cycle numbers at a high charge rate of 1C, indicating that the cycle performance of the lithium ion battery or the cycle performance at a high rate is poor, the charge rate window of the lithium ion battery is small, and the cycle performance and charge rate window of the lithium ion battery are not improved.
  • the mass percentage content m% of the compound of formula (I) generally also affects the cycle performance and charge rate window of the lithium ion battery. From Examples 1-1 to 1-7 and Comparative Example 9, it can be seen that the mass percentage content m% of the compound of formula (I) is selected.
  • the lithium-ion battery within the scope of the present application has a high number of cycles at charging rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion battery has good cycle performance and a wide charging rate window.
  • the type of compound of formula (I) also generally affects the cycle performance and charge rate window of the lithium ion battery. It can be seen from Examples 1-4, 1-8 to 1-13 that the lithium ion battery using the type of compound of formula (I) within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium ion battery has good cycle performance and a wide charge rate window.
  • the mass percentage content n% of the polymerized monomers also generally affects the cycle performance and charge rate window of the lithium-ion battery. From Examples 1-14 to 1-18, Comparative Examples 7 and 8, it can be seen that the lithium-ion battery with the mass percentage content n% of the polymerized monomers within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion battery has good cycle performance and a wide charge rate window.
  • the type of polymerized monomers also generally affects the cycle performance and charge rate window of lithium-ion batteries. It can be seen from Examples 1-8, 1-16, 1-19 and 1-20 that lithium-ion batteries using polymerized monomers within the scope of the present application have a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion batteries have good cycle performance and a wide charge rate window.
  • the value of (n/M single )/(m/M (I) ) also generally affects the cycle performance and charge rate window of the lithium ion battery. From Examples 1-1 to 1-25, it can be seen that the lithium ion battery with the value of (n/M single )/(m/M (I) ) within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium ion battery has good cycle performance and a wide charge rate window.
  • the mass percentage ⁇ % of the inorganic solid electrolyte usually also affects the cycle performance and charge rate window of the lithium ion battery. It can be seen from Examples 1-19 and 2-1 to 2-7 that the lithium ion battery using the inorganic solid electrolyte with a mass percentage ⁇ % within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium ion battery has good cycle performance and a wide charge rate window.
  • n/ ⁇ also generally affects the cycle performance and charge rate window of the lithium-ion battery. It can be seen from Examples 1-19 and 2-1 to 2-7 that the lithium-ion battery with the value of n/ ⁇ within the range of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion battery has good cycle performance and a wide charge rate window.
  • the type of inorganic solid electrolyte usually also affects the cycle performance and charge rate window of the lithium-ion battery. From Examples 1-3 and 2-14, 1-19, 2-1, 2-8 to 2-13, 1-20 and 2-15, it can be seen that the lithium-ion battery using the inorganic solid electrolyte within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion battery has good cycle performance and a wide charge rate window.
  • Example 2-1 and Example 3-1 to Example 3-7 it can be seen from Example 2-1 and Example 3-1 to Example 3-7 that when an initiator is further added to the electrolyte so that the polymerization monomers in the electrolyte are polymerized using the initiator, the cycle performance and charge rate window of the lithium-ion battery are further improved.
  • the mass percentage of the initiator y% usually also affects the cycle performance and charge rate window of the lithium-ion battery. From Examples 2-1, 3-1 to 3-6, it can be seen that the lithium-ion battery with the mass percentage of the initiator y% within the scope of the present application has a higher number of cycles at the charge rates of 0.2C, 0.5C and 1C, indicating that Lithium-ion batteries have good cycle performance and a wide charge rate window.
  • the type of initiator usually also affects the cycle performance and charge rate window of the lithium-ion battery. It can be seen from Examples 3-5 and 3-7 that the lithium-ion battery using the type of initiator within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion battery has good cycle performance and a wide charge rate window.
  • Example 2-1 and Example 3-8 to Example 3-11 that by further adding an additive containing an unsaturated bond to the electrolyte, the cycle performance and charge rate window of the lithium-ion battery can be further improved.
  • the mass percentage h% of the additive containing unsaturated bonds also generally affects the cycle performance and charge rate window of the lithium-ion battery. It can be seen from Examples 2-1, 3-8 to 3-12 that the lithium-ion battery with the mass percentage h% of the additive containing unsaturated bonds within the scope of the present application has a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion battery has good cycle performance and a wide charge rate window.
  • the type of additive containing unsaturated bonds also generally affects the cycle performance and charge rate window of lithium-ion batteries. It can be seen from Examples 3-8 and 3-13 that lithium-ion batteries using additives containing unsaturated bonds within the scope of the present application have a high number of cycles at charge rates of 0.2C, 0.5C and 1C, indicating that the lithium-ion batteries have good cycle performance and a wide charge rate window.

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Abstract

Appareil électrochimique et appareil électronique. L'appareil électrochimique comprend un électrolyte, une feuille d'électrode négative, un séparateur et une feuille d'électrode positive ; l'électrolyte comprend un composé représenté par la formule (I) et un monomère polymérisé, sur la base de la masse de l'électrolyte, la teneur en pourcentage en masse du composé représenté par la formule (I) équivalant à m %, 0,01 ≤ m ≤ 6, la teneur en pourcentage en masse du monomère polymérisé équivalant à n %, et 0,5 ≤ n ≤ 10 ; la feuille d'électrode négative comprend un collecteur de courant d'électrode négative et une couche de matériau d'électrode négative agencée sur au moins une surface du collecteur de courant d'électrode négative, la couche de matériau d'électrode négative comprenant un matériau actif d'électrode négative contenant du silicium.
PCT/CN2023/085420 2023-03-31 2023-03-31 Appareil électrochimique et appareil électronique Ceased WO2024197800A1 (fr)

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JP2007258103A (ja) * 2006-03-24 2007-10-04 Mitsubishi Chemicals Corp 非水系電解液及び非水系電解液電池
CN101438449A (zh) * 2004-12-16 2009-05-20 U芝加哥阿谷尼有限公司 具有稳定电极的长寿命的锂电池
CN101606265A (zh) * 2007-02-16 2009-12-16 Sk能源株式会社 锂二次电池的制备
WO2022079967A1 (fr) * 2020-10-15 2022-04-21 株式会社村田製作所 Électrolyte pour batterie secondaire, et batterie secondaire

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Publication number Priority date Publication date Assignee Title
CN101438449A (zh) * 2004-12-16 2009-05-20 U芝加哥阿谷尼有限公司 具有稳定电极的长寿命的锂电池
JP2007258103A (ja) * 2006-03-24 2007-10-04 Mitsubishi Chemicals Corp 非水系電解液及び非水系電解液電池
CN101606265A (zh) * 2007-02-16 2009-12-16 Sk能源株式会社 锂二次电池的制备
WO2022079967A1 (fr) * 2020-10-15 2022-04-21 株式会社村田製作所 Électrolyte pour batterie secondaire, et batterie secondaire

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